Use stylus's CLI for easy color computations. Stylus CLI is faster than Sass and has shorter syntax for color computations.
Here's lighten and hue shift:
Not quite as elegant, but it can be useful.
If you need Sass for some reason, it also takes -i.
You have just read Easy color computations using Sass & Stylus CLI, written on March 03, 2015. This is Today I Learned, a collection of random tidbits I've learned through my day-to-day web development work. I'm Rico Sta. Cruz, @rstacruz on GitHub (and Twitter!).